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Fine turf can quickly become overrun by coarse and vigorous 'weed' grasses. These spoil the appearance of the lawn and are not easy to control, especially if allowed to invade large areas.
Coarse grasses in a lawn. Credit: RHS/John Trenholm.
In a lawn free of weed grasses, it should not be possible to easily make out the different grass species. Where different grasses are clearly distinguishable, coarse grasses are probably present. Early removal is important as there are no chemical controls. Coarser leaf blades may have poor drought tolerance or a tendency to flower at a low height.
Coarse grasses are easier to spot in a lawn than you might expect;
How do coarse grasses take hold?
Try cultural methods first;
Poa annua (annual meadow grass):
Coarse creeping grasses:
There are no selective weedkillers that can be used against coarse grasses in lawns without also killing the turf grasses.
Couch grassLawn care: spring and summerLawn care: autumnLawn weedsLawn weeds: selecting weedkillersRHS video: spring lawn careRHS video: autumn lawn careRHS video: weed control
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.